In 2005, a group of dermatologists published a study showing that frequent tanners experience a loss of control over their tanning schedule, displaying a pattern of addiction similar to smokers and alcoholics. 
Biochemical evidence indicates that tanning addicts are addicted to an opioid release experienced during tanning. When frequent tanners took an endorphin blocker in a 2006 study, they experienced severe withdrawal symptoms, while infrequent tanners experienced no withdrawal symptoms under the same conditions. 
Tanorexia is the term often used to describe a condition in which a person participates in excessive outdoor sun tanning or excessive use of other skin tanning methods (such as tanning beds) to achieve a darkerskin complexion because they perceive themselves as unacceptably pale. The syndrome is different than tanning addiction, although both may fit into the same syndrome and can be considered a subset of tanning addiction.
Although the term “tanorexia” has been commonly used by the media and several doctors to describe the syndrome, both the word and syndrome have not been widely accepted by the medical community, and is considered a slang by many. The term was coined after the medical condition anorexia nervosa, a disorder characterized by low body weight and body image distortion with an obsessive fear of gaining weight. It can be likened to the common practice of adding the suffix “-oholic” (from the term alcoholic) to the end of any action or food someone enjoys extensively and often (e.g. “choc-aholic,” “golf-oholic,” “shop-aholic,” etc.).
Serious cases of tanorexia can be considered dangerous because many of the more popular methods of tanning (such as those mentioned above) require prolonged exposure to UV radiation, which is known to be a cause of many negative side effects, including skin cancer.
Extreme instances may be an indication of body dysmorphic disorder (BDD),  a mental disorder in which one is extremely critical of his or her physique or self-image to an obsessive and compulsive degree. As it is with anorexia, a person with BDD is said to show signs of a characteristic called distorted body image. In layman’s terms, anorexia sufferers commonly believe they are overweight, many times claiming they see themselves as “fat,” when in reality, they are nutritionally underweight and physically much thinner than the average person. In the same way, a sufferer of “tanorexia” may believe him or herself to have a much lighter–even a pale–complexion when he or she is actually quite dark-skinned.
Neither tanning addiction nor tanorexia are covered under the latest edition of the DSM-IV, though they are most likely versions of similar problems already on record. To that end, a 2005 article in The Archives of Dermatology presents a case for UV light tanning addiction to be viewed as a type of substance abuse disorder.
Symptoms of Tanning Addiction
Although the syndrome has not been officially described by the medical community, it may include the following reported symptoms: intense anxiety if a session of tanning is missed, competition among peers to see which can get the darkest tan, and chronic frustration about the color of one’s skin, with the affected person being convinced his or her complexion is constantly lighter than it actually is. Notable figures known to have suffered from tanorexia are Christine Swanson and the cast of the MTV reality show Jersey Shore.
- ^ Medical News Today, Tanning addiction exists, study. August 16, 2005, accessed December 30, 2007.
- ^ M. Warthan, T. Uchida, R. Wagner, Jr. UV Light Tanning as a Type of Substance-Related Disorder. Archives of Dermatology, August 2005; vol 141: pp 963-966.
- ^ M. Kaur, A. Liguori, W. Lang, S. Rapp, A. Fleischer, Jr., S. Feldman. Induction of withdrawal-like symptoms in a small randomized, controlled trial of opioid blockade in frequent tanners. Journal of the American Academy of Dermatology, 54(4): p. 709-711, 2006
- ^ Hunter-Yates J, Dufresne RG, Phillips KA (May 2007). “Tanning in body dysmorphic disorder”. J. Am. Acad. Dermatol. 56 (5 Suppl): S107–9. doi:10.1016/j.jaad.2006.05.025. PMID 17434030.
- ^ Warthan MM, Uchida T, Wagner RF (August 2005). “UV light tanning as a type of substance-related disorder”. Arch Dermatol 141 (8): 963–6. doi:10.1001/archderm.141.8.963. PMID 16103324.